/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 26727
 * Date: 2024-02-01
 * Time: 22:20
 */
import java.util.Scanner;
class TreeNode {
    public char val;
    public TreeNode left;
    public TreeNode right;

    public TreeNode(char val) {
        this.val = val;
    }

}

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str = in.nextLine();
            TreeNode root = creatTree(str);
            inoder(root);
        }
    }

    public static int i = 0;
    public static TreeNode creatTree(String str) {
        TreeNode root = null;
        if(str.charAt(i) != '#') {
            root = new TreeNode(str.charAt(i));
            i++;
            root.left = creatTree(str);
            root.right = creatTree(str);
        }else {
            i++;
        }
        return root;
    }

    public static void inoder(TreeNode root) {
        if(root == null) {
            return;
        }
        inoder(root.left);
        System.out.print(root.val+" ");
        inoder(root.right);
    }
}